Brennan's Irish Soda Bread

Stir the milk and vinegar together, and allow to stand until curdled, about 10 minutes.

Preheat oven to 400 degrees F (200 degrees C).

Grease a baking sheet.

In a bowl, mix together the flour, sugar, baking soda, and salt.

Gradually stir the soured milk into the flour mixture until the dough just comes together, and turn the dough out onto a well-floured surface.

Knead a few times, and shape into a round.

Place the dough onto the prepared baking sheet.

With a sharp knife, cut an X shape into the top of the dough to release steam and help the bread keep its round shape.

Bake in the preheated oven until golden brown, about 45 minutes.